Like anything in life, you have to make a judgement. There is no silver bullet. Tests are very painful to maintain in all but the most well understood problems.

Like anything in life, you have to make a judgement. There is no silver bullet. Tests are very painful to maintain in all but the most well understood problems. There is a ton of great software we all rely on that doesn't have much testing. Having a ton of people rely and test beta versions of your code is much more valuable then any test suite. Dare to think.